170257987 has 2 divisors, whose sum is σ = 170257988. Its totient is φ = 170257986.

The previous prime is 170257961. The next prime is 170257991. The reversal of 170257987 is 789752071.

170257987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-170257987 is a prime.

It is not a weakly prime, because it can be changed into another prime (170257957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85128993 + 85128994.

It is an arithmetic number, because the mean of its divisors is an integer number (85128994).

Almost surely, 2^170257987 is an apocalyptic number.

170257987 is a deficient number, since it is larger than the sum of its proper divisors (1).

170257987 is an equidigital number, since it uses as much as digits as its factorization.

170257987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 46.

The square root of 170257987 is about 13048.2944096154. The cubic root of 170257987 is about 554.2459114545.

The spelling of 170257987 in words is "one hundred seventy million, two hundred fifty-seven thousand, nine hundred eighty-seven".